Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1988-08-05
1989-11-07
Lieberman, Allan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 74, 525 77, 525 80, 525 86, C08L 5104, C08L 5502, C08L 7908
Patent
active
048793434
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a heat and impact resistant resin composition. More particularly, it relates to a resin composition obtained by incorporating an ABS resin to a rubber-modified resin prepared by graft-copolymerizing an N-substituted maleimide-containing monomer to a conjugated diene rubber, which is capable of providing a molded product having excellent heat and impact resistance.
BACKGROUND ART
It is well known to blend a rubber with a hard resin to obtain an impact resistant resin-modified with the rubber. An ABS resin is a typical resin of this type. However, since the heat resistance of the acrylonitrile-styrene copolymer (AS resin) as the hard resin is inadequate, it has been desired to have a hard resin having a higher heat deflection temperature.
As a styrene resin having high heat deflection temperature, for example, a copolymer of an N-substituted maleimide monomer with an aromatic vinyl monomer is known (L. E. Coleman et al., J. Polymer Sci., Vol. 38, p. 241, 1959). Further, a graft copolymer obtained by grafting a monomer mixture comprising an N-allyl-substituted maleimide, an aromatic vinyl monomer and acrylonitrile to a conjugated diene rubber and a resin composition containing such a graft copolymer have been proposed (U.S. Pat. No. 3,652,726).
However, the copolymer of an N-substituted maleimide monomer with a vinyl monomer tends to be brittle as the N-substituted maleimide monomer content increases, although the heat deflection temperature may thereby be made high. In order to overcome the brittleness, it has been proposed to blend an ABS resin (Japanese Unexamined Patent Publications Nos. 98536/1982 and 131213/1982), but such a proposal is still not satisfactory.
In order to improve the impact resistance of such a composition comprising an N-substituted maleimide styrene copolymer and an ABS resin, it is necessary to increase the amount of the ABS resin in the composition or to increase the proportion of the graft rubber in the ABS resin to be blended. On the other hand, the mechanical properties such as heat resistance and rigidity deteriorate with an increase of the amount of the ABS resin or with an increase of the proportion of the graft rubber in the ABS resin. Therefore, it is desired to develop a resin composition of an N-substituted maleimide-styrene copolymer which is excellent in both the heat resistance and the impact resistance.
DISCLOSURE OF THE INVENTION
The present inventors have conducted extensive research with an aim to solve the above-mentioned various drawbacks inherent to the conventional rubber-modified resin compositions comprising a copolymer of an N-substituted maleimide monomer and a vinyl monomer and have finally arrived at the present invention. Namely, it is an object of the present invention to provide a resin composition capable of providing a molded product having excellent heat and impact resistance, particularly remarkably improved dart impact strength, by blending a graft copolymer obtained by graft polymerizing a monomer mixture containing an N-substituted maleimide monomer to a conjugated diene rubber, with an ABS resin having a certain specific rubber particle size.
The present invention provides a heat and impact resistant resin composition which comprises:
(i) from 5 to 89 parts by weight of a graft copolymer resin (A) obtained by graft polymerizing from 30 to 75 parts by weight of a monomer mixture comprising from 30 to 80% by weight of an aromatic vinyl monomer, from 10 to 50% by weight of an N-substituted maleimide monomer, from 10 to 40% by weight of a vinyl cyanide monomer and from 0 to 30% by weight of other vinyl monomer copolymerizable with these monomers (provided that the total amount of the monomer mixture is 100% by weight ) onto from 25 to 70 parts by weight of a conjugated diene rubber (a);
(ii) from 10 to 90 parts by weight of a copolymer resin (B) obtained by polymerizing a monomer mixture comprising from 30 to 80% by weight of an aromatic vinyl monomer, from 10 to 50% by weight of an N-substitut
REFERENCES:
patent: 3766142 (1973-10-01), Nield et al.
patent: 4151224 (1979-04-01), Hendy et al.
Aoki Yuji
Miyazaki Hiroaki
Lieberman Allan M.
Mitsubishi Monsanto Chemical Company
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